Meaning & Definition of Watchful in English

1. Engaged in or accustomed to close observation

• "Caught by a couple of alert cops"

• "Alert enough to spot the opportunity when it came"

• "Constantly alert and vigilant, like a sentinel on duty"

2. Experiencing or accompanied by sleeplessness

• "Insomniac old people"

• "Insomniac nights"

• "Lay sleepless all night"

• "Twenty watchful, weary, tedious nights"- shakespeare